package com.atguigu.chapter11;

import com.atguigu.bean.WaterSensor;
import org.apache.flink.api.common.eventtime.WatermarkStrategy;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.table.api.Table;
import org.apache.flink.table.api.bridge.java.StreamTableEnvironment;

import java.time.Duration;

import static org.apache.flink.table.api.Expressions.$;

/**
 * @Author lizhenchao@atguigu.cn
 * @Date 2021/7/24 10:03
 */
public class Flink09_Time_EventTime {
    public static void main(String[] args) {
        Configuration conf = new Configuration();
        conf.setInteger("rest.port", 20000);
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment(conf);
        env.setParallelism(1);
        
        DataStream<WaterSensor> stream = env.fromElements(
            new WaterSensor("sensor_1", -1L, 10),
            new WaterSensor("sensor_1", 2L, 20),
            new WaterSensor("sensor_2", 3L, 30),
            new WaterSensor("sensor_1", 4L, 40),
            new WaterSensor("sensor_1", 5L, 50)
        ).assignTimestampsAndWatermarks(
            WatermarkStrategy
                .<WaterSensor>forBoundedOutOfOrderness(Duration.ofSeconds(2))
                .withTimestampAssigner((ws, ts) -> ws.getTs() * 1000)
        );
        
        StreamTableEnvironment tenv = StreamTableEnvironment.create(env);
        
        // 1. 可以在schema后面添加一个字段用来表示事件时间
        //Table table = tenv.fromDataStream(stream, $("id"), $("ts"), $("vc"), $("et").rowtime());
        // 2. 把long型的字段标记为事件时间
        Table table = tenv.fromDataStream(stream, $("id"), $("ts").rowtime(), $("vc"));
        table.execute().print();
        
    }
}
